Update changelog

CHANGELOG.md

@@ -14,6 +14,7 @@
 ### Updated
 - Updated presenter components, load fallback image on errors ([273170c5](https://github.com/pixelfed/pixelfed/commit/273170c5))
 - Updated Story model, hide json attribute by default ([de89403c](https://github.com/pixelfed/pixelfed/commit/de89403c))
+- Updated compose view, add deprecation notice for v3 ([57e155b9](https://github.com/pixelfed/pixelfed/commit/57e155b9))
 
 ### Changed